PRIMARY DEFENCES
- Created by: Remya Salimkumar
- Created on: 26-05-15 21:03
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- PRIMARY DEFENCES: prevent pathogens from entering the body
- SKIN
- outer layer called EPIDERMIS
- most cells of epidermis are KERATINOCYTES
- produced by mitosis at base of epidermis which migrate out to surface of skin
- as they migrate, the dry out and cytoplasm is replaced by KERATIN. this is called KERATINISATION
- takes about 30 days
- by the time the cells reach surface, they are dead. this acts as the effective barrier to pathogens
- as they migrate, the dry out and cytoplasm is replaced by KERATIN. this is called KERATINISATION
- produced by mitosis at base of epidermis which migrate out to surface of skin
- most cells of epidermis are KERATINOCYTES
- outer layer called EPIDERMIS
- MUCOUS MEMBRANES
- food and air from environment may harbour many microorganisms, so airways and lungs and digestive systems are protected.
- Epithelial layer contains GOBLET CELLS
- mucus traps pathogens
- Epithelium also has ciliated cells
- waft away mucus to top of trachea to be swallowed and passed down to digestive system
- stomach acidity (low pH) denatures pathogens enzymes and kills
- mucus traps pathogens
- stomach acidity (low pH) denatures pathogens enzymes and kills
- waft away mucus to top of trachea to be swallowed and passed down to digestive system
- Epithelial layer contains GOBLET CELLS
- Is also in
- gut
- genital areas
- anus
- ears
- nose
- food and air from environment may harbour many microorganisms, so airways and lungs and digestive systems are protected.
- EYES
- antibodies in tear fluid
- EAR CANAL
- wax traps pathogens
- VAGINA
- Maintains relatively acidic conditiond
- SKIN
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